function vol(){
var diam = document.volume.diam.value *1;
var depth = document.volume.depth.value *1;
var halfDiam = (diam/2);
var width = halfDiam * halfDiam;
var pieTot = width * 3.1416;
var cubFt = pieTot * depth;
var gallons = cubFt * 7.5;
var answer = gallons.toFixed(1);
document.volume.answer.value = answer;
}
document.write('<table align="center"class="table01" width="300">');					
document.write('<tr><td>This tool will tell you the gallons in your <b>round pond</b>.<br>Enter the proper measurements in feet, into the form below.</td></tr>');
document.write('<tr><td align="center"><form name="volume"></td></tr>');	
document.write('<tr><td align="center">Diameter in feet: <input type="text" name="diam" size="3"></td></tr><tr><td align="center">Average depth in feet: <input type="text" name="depth" size="3"></td></tr>');	
document.write('<tr><td align="center"><input type="button" name="go" value="Calculate" onClick="vol();">&nbsp;&nbsp;<input type="reset" value="Clear"></td></tr>');	
document.write('<tr><td>The total gallons in your pond would be: <input type="text" name="answer" size="4"> gallons</td></tr>');
document.write('<tr><td></form></td></tr>');	
document.write('</table>');